本文選題：粟米糠 + 米曲霉��； 參考：《環(huán)境科學(xué)學(xué)報》2017年07期

【摘要】：以粟米糠(MC)為原料,添加自鉛鋅尾礦渣中分離的耐鉛菌米曲霉(HA)制成粟米糠-耐Pb菌株復(fù)合吸附劑(MCH),研究固定床系統(tǒng)中MCH對Pb~(2+)的動態(tài)吸附特性,考察吸附柱高度、初始離子濃度、進(jìn)水流速對穿透曲線特性的影響.研究結(jié)果表明,復(fù)合吸附劑在固定床系統(tǒng)中的吸附性能明顯優(yōu)于單一吸附劑;MCH對Pb~(2+)的吸附穿透時間與吸附柱高成正相關(guān),與初始離子濃度和進(jìn)水流速成負(fù)相關(guān),傳質(zhì)區(qū)長度與吸附柱高成負(fù)相關(guān),與初始離子濃度和進(jìn)水流速成正相關(guān);初始離子濃度對穿透曲線和傳質(zhì)區(qū)長度影響最小.采用BDST、Yoon-Nelson和Thomas模型擬合試驗(yàn)數(shù)據(jù)結(jié)果顯示,在較高流速和初始離子濃度條件下,實(shí)測與BDST模型擬合數(shù)據(jù)的相對誤差最小,其原因可解釋為BDST模型忽略了內(nèi)部擴(kuò)散和質(zhì)量傳遞間阻力的影響;在吸附柱較低、初始離子濃度或進(jìn)水流速較大條件下,由于傳質(zhì)推動力過大以至傳質(zhì)區(qū)被瞬間穿透,吸附質(zhì)在吸附柱內(nèi)停留時間很短,Yoon-Nelson和Thomas模型無法準(zhǔn)確預(yù)測其穿透時間和擬合穿透曲線;總體上對比其它模型,Thomas模型擬合穿透曲線的效果較好,說明在MCH固定床Pb~(2+)的吸附過程中沒有軸向擴(kuò)散且具有平推流作用.
[Abstract]:The dynamic adsorption characteristics of MCH for Pb~(2 in fixed bed system were studied by adding lead resistant fungi (Aspergillus oryzae) isolated from lead-zinc tailings as raw materials to the composite adsorbent of millet bran and Pb resistant strain. The influence of initial ion concentration and influent velocity on the characteristic of penetration curve. The results show that the adsorption performance of the composite adsorbent in the fixed bed system is obviously better than that of the single adsorbent Pb~(2. The adsorption penetration time of the composite adsorbent is positively correlated with the high adsorption column formation, and is negatively correlated with the initial ion concentration and the velocity of inlet flow. The length of the mass transfer zone is negatively correlated with the adsorption column Gao Cheng, and is positively correlated with the initial ion concentration and the velocity of the inlet current, and the initial ion concentration has the least effect on the penetration curve and the length of the mass transfer zone. The experimental data were fitted with the Thomas model and Yoon-Nelson model. The results showed that the relative error between the measured data and the BDST model was the least under the condition of high velocity of flow and initial ion concentration. The reason can be explained by the fact that the BDST model neglects the influence of the resistance between internal diffusion and mass transfer. Under the condition of lower adsorption column, higher initial ion concentration or higher influent velocity, the mass transfer zone is penetrated instantly because the mass transfer force is too large. The retention time of adsorbate in the adsorption column is very short. Yoon-Nelson and Thomas models can not accurately predict the penetration time and fit the penetration curve. The results show that there is no axial diffusion in the adsorption process of MCH fixed bed Pb~(2.
【作者單位】： 中南林業(yè)科技大學(xué)環(huán)境科學(xué)與工程研究所;
【基金】：國家“十二五”科技惠民計劃項(xiàng)目(No.2012GS430203) 國家“十二五”科技支撐計劃項(xiàng)目(No.2012BAC09B03) 湖南省環(huán)境科學(xué)與工程重點(diǎn)學(xué)科建設(shè)項(xiàng)目資助~~
【分類號】：O647.33;X703;X712

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